我想在询问触摸 ID 时模糊背景，一旦授权成功，viewcontroller 需要可见。但这没有发生。即使授权成功，viewcontroller 仍然模糊。谁能帮我如何解决这个问题？
import UIKit
import LocalAuthentication
class TabBarViewController: UITabBarController {
@IBOutlet weak var noteTabBar: UITabBar!
override func viewDidLoad() {
super.viewDidLoad()
self.authenticateUser()
self.tabBar.hidden = false
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
let userDefaults = NSUserDefaults.standardUserDefaults()
userDefaults.setObject(false, forKey: "sendModeToggle")
userDefaults.setObject("Avenir-Medium", forKey: "font")
userDefaults.setObject(13, forKey:"fontSize")
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
// MARK: Touch ID Authentication
func authenticateUser()
{
let context = LAContext()
var error: NSError?
let reasonString = "Authentication is needed to access your app! :)"
let blurEffect = UIBlurEffect(style: .Light)
let blurVisualEffectView = UIVisualEffectView(effect: blurEffect)
blurVisualEffectView.frame = view.bounds
self.view.addSubview(blurVisualEffectView)
if context.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: &error)
{
context.evaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, localizedReason: reasonString, reply: { (success, policyError) -> Void in
if success
{
print("Authentication successful! :) ")
blurVisualEffectView.removeFromSuperview()
}
else
{
switch policyError!.code
{
case LAError.SystemCancel.rawValue:
print("Authentication was cancelled by the system.")
/*case LAError.UserCancel.rawValue:
print("Authentication was cancelled by the user.")
*/
case LAError.UserFallback.rawValue:
print("User selected to enter password.")
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
blurVisualEffectView.removeFromSuperview()
})
default:
print("Authentication failed! :(")
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
blurVisualEffectView.removeFromSuperview()
})
}
}
})
}
else
{
print(error?.localizedDescription)
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.showPasswordAlert()
})
}
}
}
最佳答案
由于您要在闭包中删除 View ，因此您可能不在主线程中。尝试将删除代码分派(dispatch)到主线程:
if success {
print("Authentication successful! :) ")
dispatch_async(dispatch_get_main_queue()) {
blurVisualEffectView.removeFromSuperview()
}
}
关于ios - removeFromSuperview() 不工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38635447/